package com.hoperun.nocserver.common.utils;

import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.Cipher;

import org.apache.commons.codec.binary.Base64;

/*** Created by lake on 17-4-12. */

public class RSACoder {
	public static final String KEY_ALGORITHM = "RSA";
	public static final String SIGNATURE_ALGORITHM = "MD5withRSA";

	private static final String PUBLIC_KEY = "RSAPublicKey";
	private static final String PRIVATE_KEY = "RSAPrivateKey";

	public static byte[] decryptBASE64(String key) {
		return Base64.decodeBase64(key);
	}

	public static String encryptBASE64(byte[] bytes) {
		return Base64.encodeBase64String(bytes);
	}

	/**
	 * 用私钥对信息生成数字签名
	 *
	 * @param data
	 *            加密数据
	 * @param privateKey
	 *            私钥
	 * @return
	 * @throws Exception
	 */
	public static String sign(byte[] data, String privateKey) throws Exception {
		// 解密由base64编码的私钥
		byte[] keyBytes = decryptBASE64(privateKey);
		// 构造PKCS8EncodedKeySpec对象
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		// KEY_ALGORITHM 指定的加密算法
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		// 取私钥匙对象
		PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
		// 用私钥对信息生成数字签名
		Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
		signature.initSign(priKey);
		signature.update(data);
		return encryptBASE64(signature.sign());
	}

	/**
	 * 校验数字签名
	 *
	 * @param data
	 *            加密数据
	 * @param publicKey
	 *            公钥
	 * @param sign
	 *            数字签名
	 * @return 校验成功返回true 失败返回false
	 * @throws Exception
	 */
	public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
		// 解密由base64编码的公钥
		byte[] keyBytes = decryptBASE64(publicKey);
		// 构造X509EncodedKeySpec对象
		X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
		// KEY_ALGORITHM 指定的加密算法
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		// 取公钥匙对象
		PublicKey pubKey = keyFactory.generatePublic(keySpec);
		Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
		signature.initVerify(pubKey);
		signature.update(data);
		// 验证签名是否正常
		return signature.verify(decryptBASE64(sign));
	}

	public static byte[] decryptByPrivateKey(byte[] data, String key) throws Exception {
		// 对密钥解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得私钥
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
		// 对数据解密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, privateKey);
		return cipher.doFinal(data);
	}

	/**
	 * 解密<br>
	 * 用私钥解密
	 *
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] decryptByPrivateKey(String data, String key) throws Exception {
		return decryptByPrivateKey(decryptBASE64(data), key);
	}

	/**
	 * 解密<br>
	 * 用公钥解密
	 *
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] decryptByPublicKey(byte[] data, String key) throws Exception {
		// 对密钥解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得公钥
		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key publicKey = keyFactory.generatePublic(x509KeySpec);
		// 对数据解密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, publicKey);
		return cipher.doFinal(data);
	}

	/**
	 * 加密<br>
	 * 用公钥加密
	 *
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] encryptByPublicKey(String data, String key) throws Exception {
		// 对公钥解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得公钥
		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key publicKey = keyFactory.generatePublic(x509KeySpec);
		// 对数据加密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, publicKey);
		return cipher.doFinal(data.getBytes());
	}

	/**
	 * 加密<br>
	 * 用私钥加密
	 *
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] encryptByPrivateKey(byte[] data, String key) throws Exception {
		// 对密钥解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得私钥
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
		// 对数据加密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, privateKey);
		return cipher.doFinal(data);
	}

	/**
	 * 取得私钥
	 *
	 * @param keyMap
	 * @return
	 * @throws Exception
	 */
	public static String getPrivateKey(Map<String, Key> keyMap) throws Exception {
		Key key = (Key) keyMap.get(PRIVATE_KEY);
		return encryptBASE64(key.getEncoded());
	}

	/**
	 * 取得公钥
	 *
	 * @param keyMap
	 * @return
	 * @throws Exception
	 */
	public static String getPublicKey(Map<String, Key> keyMap) throws Exception {
		Key key = keyMap.get(PUBLIC_KEY);
		return encryptBASE64(key.getEncoded());
	}

	/**
	 * 初始化密钥
	 *
	 * @return
	 * @throws Exception
	 */
	public static Map<String, Key> initKey() throws Exception {
		KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
		keyPairGen.initialize(1024);
		KeyPair keyPair = keyPairGen.generateKeyPair();
		Map<String, Key> keyMap = new HashMap<String, Key>(2);
		keyMap.put(PUBLIC_KEY, keyPair.getPublic());// 公钥
		keyMap.put(PRIVATE_KEY, keyPair.getPrivate());// 私钥
		return keyMap;
	}

	public static void main(String[] args) throws Exception {

		Map<String, Key> keyMap = RSACoder.initKey();
		String publicKey = RSACoder.getPublicKey(keyMap);
		String privateKey = RSACoder.getPrivateKey(keyMap);
		System.err.println("公钥: \n\r" + publicKey);
		System.err.println("私钥： \n\r" + privateKey);

		System.err.println("私钥加密——公钥解密");
		String inputStr = "rtE0ykyZDu+h8WwiR2Z+R0iB6+dM5ffEHNSYnBFi7Xg7gw6pk2vFCB5EiAiiLLlbIxlISTKMbrr4Vbe+/zzIpubNnx+kiCA/11nq7nv7jvLl294QHC0qoKaYFayqIt3K2ApsoiSNiaAjrEMoZWzaFjx95KFp8gYfiXlJdDvQPT8=";
		byte[] data = inputStr.getBytes();
		byte[] encodedData = RSACoder.decryptByPrivateKey(data,
				"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");
		System.err.println("解密后: " + encodedData.length);
		byte[] decodedData = RSACoder.decryptByPublicKey(encodedData, publicKey);
		String outputStr = new String(decodedData);
		System.err.println("加密前: " + inputStr + "\n\r" + "解密后: " + outputStr);

		System.err.println("私钥签名——公钥验证签名");
		// 产生签名
		String sign = RSACoder.sign(encodedData, privateKey);
		System.err.println("签名:" + sign);
		// 验证签名
		boolean status = RSACoder.verify(encodedData, publicKey, sign);
		System.err.println("状态:" + status);

		System.err.println("加密前: " + new String("AFdafdasfdasd"));
		// byte[] data = RSACoder.encryptByPublicKey("AFdafdasfdasd",
		// "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDSsViEp2fUuykhvG8Fr8HOpjVOuotDvF0jG3+Prwetse6wWmD5cTVolo/kk5YmseJOy6rG0t0cmBV+CTXOCNRZ9LQNZ7G1v9r/Pgg5GoS/lTZgAolcXRELRnqYb85RNLo0/yH4ULtdukPgk9E2YgTxuBzjaJlCIi4vg/WKvX0erwIDAQAB");
		// String inputStr =
		//
		// "rtE0ykyZDu+h8WwiR2Z+R0iB6+dM5ffEHNSYnBFi7Xg7gw6pk2vFCB5EiAiiLLlbIxlISTKMbrr4Vbe+/zzIpubNnx+kiCA/11nq7nv7jvLl294QHC0qoKaYFayqIt3K2ApsoiSNiaAjrEMoZWzaFjx95KFp8gYfiXlJdDvQPT8=";
		//
		// System.err.println("加密后: " + new String(data, "UTF-8"));
		// byte[] data = inputStr.getBytes();
		//
		// byte[] encodedData = RSACoder.decryptByPrivateKey(data,
		// "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");
		// System.err.println("解密后: " + new String(encodedData));

	}

}
